Whenever I try to edit any encoding options in Adobe Media Encoder for video, it seems that the preview window that should normally display the input and the final output, as well as allow me to crop the footage, is now blank. I've tried checking for updates, reinstalling media encoder, and as of right now, retrieving new updates from Adobe to update AME to 5.0.1.

I'm using AME CS5 version 5.0.1.0 for Mac OS X on an iMac with a Intel Core i3, with 8GB of RAM, which is running Mac OS X 10.7.3.